docs: def get_amount_in_base_currency(self, currency: str, amount: Decimal) -> Decimal:
          """ Calculates the amount in base currency """
          assert isinstance(amount, Decimal)
  
          # If this is already the base currency, do nothing.
          if currency == self.get_default_currency().mnemonic:
              return amount
  
          agg = self.get_currency_aggregate_by_symbol(currency)
          if not agg:
              raise ValueError(f"Currency not found: {currency}!")
  
          # TODO use pricedb for the price.
          rate_to_base = agg.get_latest_price()
          if not rate_to_base:
              raise ValueError(f"Latest price not found for {currency}!")
          assert isinstance(rate_to_base.value, Decimal)
  
          result = amount * rate_to_base.value
          return result